fix(supplementalDetails): tolerate missing 'value' in NLP results DEV-2508

[platreth]

📣 Summary

Downloading data as XLS or CSV no longer fails on projects that have an automatic transcription still waiting to be reviewed.

📖 Description

If a project had a transcription that had been generated but not yet accepted, every XLS and CSV download of that project failed with a generic "Export Failed" message. Downloads now work again, and a transcription that hasn't been accepted yet is left blank in the file, as it was before.

💭 Notes

• kpi DEV-2333 started emitting {'languageCode': …, 'pendingReview': True} with no value key. QualNameSplittingTransxField branched on languageCode and then read responses['value'] unguarded, so a single un-accepted transcript killed the whole export.
• The translation branch a few lines below already swallowed that KeyError and returned ''; this just makes the transcript branch consistent with it.
• QualField gets the same guard: a qual response may legitimately hold only verified and no value (kpi's qualCommon oneOf). Not reachable through kpi's current output transform — defensive only.
• ⚠️ This restores pre-DEV-2333 behaviour, where an un-accepted result exports blank. If exports should instead include the un-reviewed text, the fix belongs in kpi (subsequences/actions/mixins.py) rather than here — hence draft.
• Needs a follow-up kpi PR bumping the formpack pin.

👀 Preview steps

1. ℹ️ pip install -r dev-requirements.txt
2. run pytest tests/test_additional_field_exports.py
3. 🔴 [on main] test_transcript_pending_review_exports_as_blank and test_qual_response_without_value_exports_as_blank fail with KeyError: 'value', at fields.py:717 and fields.py:552
4. 🟢 [on PR] full suite passes — 255 passed, 2 skipped

[greptile-apps]

Greptile Summary

Updates supplemental-detail exports to:

• Return a blank value when qualitative responses omit value.
• Return a blank transcript when pending-review NLP results omit value.
• Add regression coverage for both payload shapes.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

_{Reviews (2): Last reviewed commit: "docs(test): clarify pre-kpi#7344 payload..." | Re-trigger Greptile}

[noliveleger]

Only nitpicks but overall LGTM.

Also ask your robot to not limit the PR description to 80 characters per line :-D

[noliveleger]

LGTM